Production of artificial silk threads



Feb. 23, 1932. J BRANDWQOD 1,846,627

PRODUCTION OF ARTIFICIAL SILK THREADS Filed April 21, 1930 Iizven/or.

5 spinning device.

Patented Feb. 23, 1932 UNITED STATES PATENT OFFICE 4 PRODUCTION OFARTIFICIAL SILK THREADS Application filed April 21, 1930, Serial No.446,031, and in Great Britain November 6, 1929.

, The invention relates to the production of artificial silk threads andmore specifically to that system of production wherein the threads arewound upon a spool or bobbin in a bobbin winding frame and then passedto a mechanical twisting device which imparts the twist to the threads.7

In a usual extrusion process, spinning and winding take place on a smallbobbin in the spinning machine, and the threads duringsubsequenttwisting are drawn over the end of the bobbinthe latter being suitablyheld-and over a rotating winding drum on to the twisting device whichmay be a cap This is disadvantageous as friction on the threads is,always present.

The present invention has for an object a means for producing a twistedthread by which means the friction to which I have 0 referred may beeliminated and the use of a winding drum altogether avoided. A furtherobject of the invention is to make possible an increase in theproduction of a spinning machine. With these objects in view andaccording to my invention the threads are wound upon a spool of largediameter as compared with the radial thickness of thread mass which maybe wound upon it, the threads being then drawn off under tension to athread twisting device while a positive rotation is imparted to thespool, the said threads leaving the spool transversely thereof. To applytension the peripheral speed at which the large spool is rotated may beregulated in relation to the speed of drawofi by the twisting device, togive a desired tension. The threads thus leave the large spool coil bycoil exactly as they were wound on, and not over the spool end, ashereto-.

fore.

The provision of a large spool as aforesaid and the drawing of thethreads therefrom in the manner in which they were wound on, that is tosay transversely of the spool length, gives an even andregular deliverywith desired tension, and eliminates friction. A conspicuous advantageof the use of a large spool is that such sp ool may itselfbe employed inthe bobbin spinning frame, nstead of the usual small spool. The largespool being cross wound in such machine it is sufficient to take it fromthe machine, mount it as before described, and proceed to cap twisting.I find by experiment that a spool of say six inches diameter on thebarrel can be wound with a thickness of about five-eighths of an inch ofthreads evenly and without diificulty, thus considerably increasing thespinning frame production by greatly lessening the dofiing periods, andeliminating the handlingof large quantities of small spools.

The large spool may be foraminous so that any desired fluid treatmentmay be carried out upon the threads wound thereon, before twisting takesplace.

The means for rotating the large spool may be any convenient and, ifdesired, known compensator means may be employed to vary the rotationalspeed to keep the peripheral speed constant as the diameter of woundthread decreases due to unwinding. With a spool of large diameter ofbarrel as before described however the peripheral speed variation duringthe whole of the unwinding is negligible, and does not affect theultimate twist.

A convenient and simple form of apparatus for the purpose of performingthe invention is illustrated in the annexed. diagrammatic drawing, whichis a side elevation of a spool in position with its rotating means andshowing the passage ofthe threads from the spool to a twisting device.

The spool 1 is of large diameter on the barrel thereof as shown, and hasflanges 2, the threads wound thereon being designated by w in thedrawing. A turntable 3 which may be of wood or may be of metal providedwith a friction surface, for instance ebonite or wood, is rotatablymounted in a bar 4 extending the length of the twisting frame, and

desired number of twisting heads on the frame, each mounted as shown toreceive a spool, and all of them driven from discs such as 7 fixed onshaft 8 which extends the length of the frame.

From spool l the thread av passes through a guide 9 and thence to threadguide 10 and from the latter proceeds to a cap twisting device of knowncharacter shown at 11, being wound on a bobbin or pirn 12.

Each cap spindle of a frame may by a band or tape from a tin drum or thelike as usual in yarn spinning frames. The fact that the spool 1 ismerely placed in position on the turntable 3 allows of easy removal ofthe said spool when empty and its replacement by a full one, andfurther, it will yield to any incidental and undesired pull upon thethread passing through the guides 9 and 10.

I claim 1. For the twisting of artificial silk threads as received fromthe spinning nozzles of a spinning machine, a spool on which the threadsmay be wound, such spool having a large diameter as compared to theradial thread thickness which may be wound thereon, means for mountingthe spool and for imparting a thread let-ofi' rotation thereto aroundits longitudinal axis, and a positively operated twisting and windingdevice adjacent to the rotated spool position.

2. For the twisting of artificial silk threads as received from thespinning nozzles of a spinning machine, a spool on which the threads maybe wound, such spool having a large diameter as compared to the radialbe driven thread thickness which may be wound thereon, a turntable onwhich the spool may be vertically disposed, means for rotating suchturntable, and a positively operated twisting and winding deviceadjacent to such turntable.

3. For the twisting of artificial silk threads as received from thespinning nozzles of a spinning machine, a spool on which the threads maybe wound, such spool having a large diameter as compared to the radialthread thickness which may be wound thereon, means for mounting thespool and for imparting athread let-oft rotation thereto around itslongitudinal axis, and a positively operated cap twisting deviceadjacent to the rotated spool position.

l. For the twisting of artificial silk threads as received from thespinning nozzles'of a spinning machine, a spool on which the threads maybe wound, such spool having a large diameter ascompared to the radialthread thickness which may be wound thereon, a turntable on which thespool may be vertically disposed, means for rotating such turntable, anda positively operated cap twisting device adjacent to such turntable:

JOHN BRANDWOOD

